I mean, if Valve was just a deli or a corner store sure. It is very likely one of the most profitable-per-employee companies in the history of the world, and probably in the running for one of the most valuable privately-held companies in the world too. We also know Gabe adores making money, so... I think it to be very unlikely it just gets passed to a kid, but who knows.

Being private, we also don't really know how much of Valve Gabe actually owns - there may be other sizeable stakeholders with a say too.

Someone with actual experience at Valve would be better suited for the role.